package com.jingyanzi.privilege.util;

import java.security.MessageDigest;
import java.util.Random;

public class Tools {

	public static String random () {
		 int flag = new Random().nextInt(999999);  
         if (flag < 100000)  
         {  
             flag += 100000;  
         }  
         return "" + flag;
	}
	
    
    public static String MD5(String key) {
        char hexDigits[] = {
                '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
        };
        try {
            byte[] btInput = key.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            return null;
        }
    }
	
	public static void main(String args[]) {
		String md5 = MD5("lg12345678");
		System.out.println(md5);
		System.out.println(MD5(md5 + "13983272841"));
		
	}
}
